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Answer: Replace with two NAT gateways in different Availability Zones.
The correct answer is C: 'Replace with two NAT gateways in different Availability Zones.' This solution ensures high availability and fault tolerance, as deploying NAT gateways in multiple Availability Zones helps to distribute the traffic and prevent a single point of failure. Unlike NAT instances, NAT gateways are managed by AWS, providing better scalability and resilience. Options A and D do not offer the required high availability and fault tolerance as they rely on a single Availability Zone. Option B adds complexity without leveraging the built-in scalability and high availability features of NAT gateways.
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As a solutions architect, recommend a highly available, fault-tolerant, and scalable solution to replace two NAT instances that can no longer support the company's application traffic requirements.
A
Replace with two NAT gateways in the same Availability Zone.
B
Implement Auto Scaling groups and Network Load Balancers for NAT instances across different Availability Zones.
C
Replace with two NAT gateways in different Availability Zones.
D
Switch to Spot Instances with a Network Load Balancer across different Availability Zones.
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